Observations of a magnetic microstructure in a co-coo obliquely evaporated tape using electron holography

Kiwamu Tohara, Weixing Xia, Yasukazu Murakami, Daisuke Shindo, Takuya Ito, Yoh Iwasaki, Junichi Tachibana

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    The magnetic microstructure in a Co-CoO obliquely evaporated tape that was subjected to a recording bit length of 250 nm was studied using electron holography. The reconstructed phase image demonstrated a periodic pattern of magnetic flux loops that were inclined to the film normal due to a well-developed columnar structure. When a magnetic field was applied to the tape for observing the remanent state by holography, the periodic pattern of the flux loops gradually disappeared. Interestingly, on applying a large magnetic field, the contour lines in the reconstructed phase image became approximately parallel to the longitudinal axis of the sliced tape, i.e. the contour lines were made to virtually deviate from the easy magnetization axis. The observations were supported by a computer simulation in which the effect of the stray magnetic field was considered.

    Original languageEnglish
    Pages (from-to)7-13
    Number of pages7
    JournalJournal of Electron Microscopy
    Volume58
    Issue number1
    DOIs
    Publication statusPublished - 2009 Jan 1

    Keywords

    • Holography
    • Magnetic domain
    • Magnetic recording

    ASJC Scopus subject areas

    • Instrumentation

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